Issue of Equity

GW Pharmaceuticals PLC ("GW Pharmaceuticals")

ISSUE OF EQUITY

Porton Down, UK, 17 February 2011: GW Pharmaceuticals (AIM: GWP) hereby announces that it has allotted 814,592 new ordinary shares of 0.1p each ("New Ordinary Shares"), issued and allotted as a result of the exercise of options under the GW Pharmaceuticals Executive Share Option Scheme.

Application has been made to the London Stock Exchange for the New Ordinary Shares to be admitted to trading on AIM ("Admission"). It is expected that Admission will occur at 08.00 a.m. on 23 February 2011. Following Admission the total number of ordinary shares of 0.1p each in issue will be 131,549,592 with each share carrying one voting right. There are no shares held in treasury.

For further information, please contact:

GW Pharmaceuticals PLC +44 (0)1980 557 000

Adam George, Company Secretary

Peel Hunt LLP (Nominated Adviser)

James Steel/Vijay Barathan +44 (0) 20 7418 8900